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Aaru/Aaru.Images/Apple2MG/Read.cs

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// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename : Read.cs
// Author(s) : Natalia Portillo <claunia@claunia.com>
//
// Component : Disk image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
// Reads XGS emulator disk images.
//
// --[ License ] --------------------------------------------------------------
//
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
// Copyright © 2011-2023 Natalia Portillo
// ****************************************************************************/
using System;
using System.IO;
using System.Text;
using Aaru.CommonTypes;
using Aaru.CommonTypes.Enums;
using Aaru.CommonTypes.Interfaces;
using Aaru.Console;
using Aaru.Filters;
using Aaru.Helpers;
namespace Aaru.Images;
public sealed partial class Apple2Mg
{
#region IWritableImage Members
/// <inheritdoc />
public ErrorNumber Open(IFilter imageFilter)
{
Stream stream = imageFilter.GetDataForkStream();
stream.Seek(0, SeekOrigin.Begin);
_imageHeader = new Header();
var header = new byte[64];
stream.EnsureRead(header, 0, 64);
var magic = new byte[4];
var creator = new byte[4];
Array.Copy(header, 0, magic, 0, 4);
Array.Copy(header, 4, creator, 0, 4);
_imageHeader = Marshal.SpanToStructureLittleEndian<Header>(header);
if(_imageHeader.DataSize == 0x00800C00)
{
_imageHeader.DataSize = 0x000C8000;
AaruConsole.DebugWriteLine(MODULE_NAME,
Localization.Detected_incorrect_endian_on_data_size_field_correcting);
}
AaruConsole.DebugWriteLine(MODULE_NAME, "ImageHeader.magic = \"{0}\"", Encoding.ASCII.GetString(magic));
AaruConsole.DebugWriteLine(MODULE_NAME, "ImageHeader.creator = \"{0}\"", Encoding.ASCII.GetString(creator));
AaruConsole.DebugWriteLine(MODULE_NAME, "ImageHeader.headerSize = {0}", _imageHeader.HeaderSize);
AaruConsole.DebugWriteLine(MODULE_NAME, "ImageHeader.version = {0}", _imageHeader.Version);
AaruConsole.DebugWriteLine(MODULE_NAME, "ImageHeader.imageFormat = {0}", _imageHeader.ImageFormat);
AaruConsole.DebugWriteLine(MODULE_NAME, "ImageHeader.flags = 0x{0:X8}", _imageHeader.Flags);
AaruConsole.DebugWriteLine(MODULE_NAME, "ImageHeader.blocks = {0}", _imageHeader.Blocks);
AaruConsole.DebugWriteLine(MODULE_NAME, "ImageHeader.dataOffset = 0x{0:X8}", _imageHeader.DataOffset);
AaruConsole.DebugWriteLine(MODULE_NAME, "ImageHeader.dataSize = {0}", _imageHeader.DataSize);
AaruConsole.DebugWriteLine(MODULE_NAME, "ImageHeader.commentOffset = 0x{0:X8}", _imageHeader.CommentOffset);
AaruConsole.DebugWriteLine(MODULE_NAME, "ImageHeader.commentSize = {0}", _imageHeader.CommentSize);
AaruConsole.DebugWriteLine(MODULE_NAME, "ImageHeader.creatorSpecificOffset = 0x{0:X8}",
_imageHeader.CreatorSpecificOffset);
AaruConsole.DebugWriteLine(MODULE_NAME, "ImageHeader.creatorSpecificSize = {0}",
_imageHeader.CreatorSpecificSize);
AaruConsole.DebugWriteLine(MODULE_NAME, "ImageHeader.reserved1 = 0x{0:X8}", _imageHeader.Reserved1);
AaruConsole.DebugWriteLine(MODULE_NAME, "ImageHeader.reserved2 = 0x{0:X8}", _imageHeader.Reserved2);
AaruConsole.DebugWriteLine(MODULE_NAME, "ImageHeader.reserved3 = 0x{0:X8}", _imageHeader.Reserved3);
AaruConsole.DebugWriteLine(MODULE_NAME, "ImageHeader.reserved4 = 0x{0:X8}", _imageHeader.Reserved4);
if(_imageHeader is { DataSize: 0, Blocks: 0 } && _imageHeader.ImageFormat != SectorOrder.ProDos)
return ErrorNumber.InvalidArgument;
byte[] tmp;
int[] offsets;
switch(_imageHeader.ImageFormat)
{
case SectorOrder.Nibbles:
tmp = new byte[_imageHeader.DataSize];
stream.Seek(_imageHeader.DataOffset, SeekOrigin.Begin);
stream.EnsureRead(tmp, 0, tmp.Length);
var nibPlugin = new AppleNib();
var noFilter = new ZZZNoFilter();
noFilter.Open(tmp);
nibPlugin.Open(noFilter);
ErrorNumber errno = nibPlugin.ReadSectors(0, (uint)nibPlugin.Info.Sectors, out _decodedImage);
if(errno != ErrorNumber.NoError)
return errno;
_imageInfo.Sectors = nibPlugin.Info.Sectors;
_imageInfo.SectorSize = nibPlugin.Info.SectorSize;
break;
case SectorOrder.Dos when _imageHeader.DataSize == 143360:
case SectorOrder.ProDos when _imageHeader.DataSize == 143360:
stream.Seek(_imageHeader.DataOffset, SeekOrigin.Begin);
tmp = new byte[_imageHeader.DataSize];
stream.EnsureRead(tmp, 0, tmp.Length);
bool isDos = tmp[0x11001] == 17 &&
tmp[0x11002] < 16 &&
tmp[0x11027] <= 122 &&
tmp[0x11034] == 35 &&
tmp[0x11035] == 16 &&
tmp[0x11036] == 0 &&
tmp[0x11037] == 1;
_decodedImage = new byte[_imageHeader.DataSize];
offsets = _imageHeader.ImageFormat == SectorOrder.Dos ? isDos ? _deinterleave : _interleave :
isDos ? _interleave : _deinterleave;
for(var t = 0; t < 35; t++)
{
for(var s = 0; s < 16; s++)
Array.Copy(tmp, t * 16 * 256 + s * 256, _decodedImage, t * 16 * 256 + offsets[s] * 256, 256);
}
_imageInfo.Sectors = 560;
_imageInfo.SectorSize = 256;
break;
case SectorOrder.Dos when _imageHeader.DataSize == 819200:
stream.Seek(_imageHeader.DataOffset, SeekOrigin.Begin);
tmp = new byte[_imageHeader.DataSize];
stream.EnsureRead(tmp, 0, tmp.Length);
_decodedImage = new byte[_imageHeader.DataSize];
offsets = _interleave;
for(var t = 0; t < 200; t++)
{
for(var s = 0; s < 16; s++)
Array.Copy(tmp, t * 16 * 256 + s * 256, _decodedImage, t * 16 * 256 + offsets[s] * 256, 256);
}
_imageInfo.Sectors = 1600;
_imageInfo.SectorSize = 512;
break;
default:
_decodedImage = null;
_imageInfo.SectorSize = 512;
_imageInfo.Sectors = _imageHeader.DataSize / 512;
break;
}
_imageInfo.ImageSize = _imageHeader.DataSize;
_imageInfo.Application = _imageHeader.Creator switch
{
CREATOR_ASIMOV => "ASIMOV2",
CREATOR_BERNIE => "Bernie ][ the Rescue",
CREATOR_CATAKIG => "Catakig",
CREATOR_SHEPPY => "Sheppy's ImageMaker",
CREATOR_SWEET => "Sweet16",
CREATOR_XGS => "XGS",
CREATOR_CIDER => "CiderPress",
CREATOR_DIC => "DiscImageChef",
CREATOR_AARU => "Aaru",
_ => string.Format(Localization.Unknown_creator_code_0,
Encoding.ASCII.GetString(creator))
};
_imageInfo.Version = _imageHeader.Version.ToString();
if(_imageHeader.CommentOffset != 0 && _imageHeader.CommentSize != 0)
{
stream.Seek(_imageHeader.CommentOffset, SeekOrigin.Begin);
var comments = new byte[_imageHeader.CommentSize];
stream.EnsureRead(comments, 0, (int)_imageHeader.CommentSize);
_imageInfo.Comments = Encoding.ASCII.GetString(comments);
}
_imageInfo.CreationTime = imageFilter.CreationTime;
_imageInfo.LastModificationTime = imageFilter.LastWriteTime;
_imageInfo.MediaTitle = Path.GetFileNameWithoutExtension(imageFilter.Filename);
_imageInfo.MediaType = GetMediaType();
_a2MgImageFilter = imageFilter;
_imageInfo.MetadataMediaType = MetadataMediaType.BlockMedia;
AaruConsole.VerboseWriteLine(Localization._2MG_image_contains_a_disk_of_type_0, _imageInfo.MediaType);
if(!string.IsNullOrEmpty(_imageInfo.Comments))
AaruConsole.VerboseWriteLine(Localization._2MG_comments_0, _imageInfo.Comments);
switch(_imageInfo.MediaType)
{
case MediaType.Apple32SS:
_imageInfo.Cylinders = 35;
_imageInfo.Heads = 1;
_imageInfo.SectorsPerTrack = 13;
break;
case MediaType.Apple32DS:
_imageInfo.Cylinders = 35;
_imageInfo.Heads = 2;
_imageInfo.SectorsPerTrack = 13;
break;
case MediaType.Apple33SS:
_imageInfo.Cylinders = 35;
_imageInfo.Heads = 1;
_imageInfo.SectorsPerTrack = 16;
break;
case MediaType.Apple33DS:
_imageInfo.Cylinders = 35;
_imageInfo.Heads = 2;
_imageInfo.SectorsPerTrack = 16;
break;
case MediaType.AppleSonySS:
_imageInfo.Cylinders = 80;
_imageInfo.Heads = 1;
// Variable sectors per track, this suffices
_imageInfo.SectorsPerTrack = 10;
break;
case MediaType.AppleSonyDS:
_imageInfo.Cylinders = 80;
_imageInfo.Heads = 2;
// Variable sectors per track, this suffices
_imageInfo.SectorsPerTrack = 10;
break;
case MediaType.DOS_35_HD:
_imageInfo.Cylinders = 80;
_imageInfo.Heads = 2;
_imageInfo.SectorsPerTrack = 18;
break;
}
return ErrorNumber.NoError;
}
/// <inheritdoc />
public ErrorNumber ReadSector(ulong sectorAddress, out byte[] buffer) => ReadSectors(sectorAddress, 1, out buffer);
/// <inheritdoc />
public ErrorNumber ReadSectors(ulong sectorAddress, uint length, out byte[] buffer)
{
buffer = null;
if(sectorAddress > _imageInfo.Sectors - 1)
return ErrorNumber.OutOfRange;
if(sectorAddress + length > _imageInfo.Sectors)
return ErrorNumber.OutOfRange;
buffer = new byte[length * _imageInfo.SectorSize];
if(_decodedImage != null)
{
Array.Copy(_decodedImage, (long)(sectorAddress * _imageInfo.SectorSize), buffer, 0,
length * _imageInfo.SectorSize);
}
else
{
Stream stream = _a2MgImageFilter.GetDataForkStream();
stream.Seek((long)(_imageHeader.DataOffset + sectorAddress * _imageInfo.SectorSize), SeekOrigin.Begin);
stream.EnsureRead(buffer, 0, (int)(length * _imageInfo.SectorSize));
}
return ErrorNumber.NoError;
}
#endregion
}
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